android保存第一次安装状态并初始化数据

package com.example.cuboo.gatherhar.activity;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.content.pm.PackageManager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import org.litepal.crud.DataSupport;public class LauchActivity extends AppCompatActivity {    private float nowVersionCode,saveVersionCode;    private static final String ISFIRSTLAUCH = "isFirstLauch";    private static final String SAVEVERSIONCODE = "saveVersionCode";    private static final String SAVESTATUS = "saveStatus";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        nowVersionCode = getVersionCode();        SharedPreferences sp  = getSharedPreferences(ISFIRSTLAUCH,MODE_PRIVATE);        saveVersionCode = sp.getFloat(SAVEVERSIONCODE,0);        if (nowVersionCode > saveVersionCode) {            //第一次安装启动            SharedPreferences.Editor editor = sp.edit();            editor.putFloat(SAVEVERSIONCODE, nowVersionCode);            editor.putBoolean(SAVESTATUS, true);            editor.commit();            //初始化数据                   }        startActivity(new Intent(this,MainActivity.class));    }    /**     * 获取应用版本号     * @return     * @throws PackageManager.NameNotFoundException     */    private float getVersionCode(){        float versionCode = 0;        try {            versionCode = getPackageManager().getPackageInfo(getPackageName(),0).versionCode;        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        return versionCode;    }}
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